重新排序时无法将UITableViewCell从其当前位置拖动

Question

我正在尝试使我的核心数据支持UITableView具有重新排序能力,在实现所有这些委托和一些技术为这里提到的核心数据后,我发现了奇怪的行为.点击编辑按钮后,重新排序图标显示就好了,我可以点击它,阴影显示,但当我尝试将其移动到其他行时,我突然失去焦点,细胞移回到它的位置.有谁知道这个问题的原因？

这是显示问题的视频

http://www.youtube.com/watch?v=ugxuLNL7BnU&feature=youtu.be

这是我的代码

- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;
}

在-tableView:moveRowAtIndexPath:toIndexPath我尝试下面的代码,只是一个空的实现,但问题仍然存在,所以我不认为这不是一个问题.

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
    _changeIsUserDriven = YES;

    NSUInteger fromIndex = sourceIndexPath.row;
    NSUInteger toIndex = destinationIndexPath.row;

    NSMutableArray *newsArray = [[self.fetchedResultsController fetchedObjects] mutableCopy];
    News *news = [self.fetchedResultsController.fetchedObjects objectAtIndex:fromIndex];

    [newsArray removeObject:news];
    [newsArray insertObject:news atIndex:toIndex];

    int i = 1;
    for (News *n in newsArray) {
        n.displayOrder = [NSNumber numberWithInt:i++];
    }

    [self saveContext];

    _changeIsUserDriven = NO;
}

FetchedResultController委托

    - (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
    {
        if (_changeIsUserDriven) {
            return;
        }
        [self.tableView beginUpdates];
    }




       - (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
                   atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
        {
            if (_changeIsUserDriven) {
                return;
            }
            switch(type) {
                case NSFetchedResultsChangeInsert:
                    [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
                    break;

                case NSFetchedResultsChangeDelete:
                    [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
                    break;
            }
        }


- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath
{
    if (_changeIsUserDriven) {
        return;
    }
    UITableView *tableView = self.tableView;

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

    - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
    {
        if (_changeIsUserDriven) {
            return;
        }
        [self.tableView endUpdates];
    }

Answer 1

最后我发现问题是因为我使用的外部库,IIViewDeckController,删除之后问题就消失了.